In stepper and servo systems, frequent speed and torque changes result in frequent current changes drawing from power supplies. When accelerating, servo / stepper drives draw high current and requires quick response for the power supplies. In de-acceleration, stepper / servo motors generates EMF charge back voltage back to servo / stepper drives, which will require the power supplies to “absorb” such voltage to protect the damage of connected stepper / servo drives.

Normal regulated switching power supplies commonly found on market are designed for powering devices with less output current changes. They can’t response quick enough to meet servo and stepper system. When adopted in servo or stepper systems, they could be even damaged because of lack the ability to handle voltage charge back from de-acceleration of servo / servo systems.

With special design, Leadshine SPS unregulated switching power supplies can meet the quick and frequent current change requirements in servo / stepper systems. Their built-in large capacitors can ensure that systems will still work normally in the process of stepper / servo de-acceleration. At ultra small sizes and very light weight (about 0.64 Kg, or 1.41 lbs), Leadshine SPS power supplies can output almost 350W continuous power (for 220 AC input) with the output voltage options of 42, 48, and 68 VDC.